What to Expect From Knee Replacement Physical Therapy Before and After Surgery
Have you been told by your doctor or orthopedic surgeon that you need a knee replacement? If you’ve been living with knee pain for months or even years, often due to arthritis, you may be ready for relief. However, the thought of having surgery and facing recovery can feel overwhelming.
The good news is that physical therapy plays an important role both before and after knee replacement surgery. Working with a licensed physical therapist can help you prepare your body for surgery, regain strength and movement, and return to the activities you enjoy.
Understanding what to expect from physical therapy can help you feel more confident and prepared for your knee replacement journey.
Physical Therapy Before Knee Replacement: The Benefits of Prehab
Many people are surprised to learn that physical therapy can begin before knee replacement surgery. This process is called pre-habilitation, or simply prehab.
The goal of prehab is to improve your strength, flexibility, balance, and movement before surgery. Building strength before your procedure can help prepare your muscles to support your new knee.
Your physical therapist will create an exercise program based on your current abilities, pain level, and goals. Your program may include:
- Knee strengthening: Exercises for your quadriceps (front thigh muscles), hamstrings (back thigh muscles), and calf muscles.
- Hip and core strengthening: Strong hips and core muscles help support your body during walking and other daily activities.
- Improving knee movement: Exercises to improve how far you can bend and straighten your knee.
- Balance training: Activities that help improve stability and reduce your risk of falling.
- Walking and mobility training: Learning how to move safely with a walker or cane if needed.
Education is another important part of prehab. Your physical therapist can explain what to expect after surgery, teach you how to use an assistive device, and help you practice everyday movements that may be difficult during early recovery.
Research supports the value of preoperative physical therapy. The American Physical Therapy Association’s (APTA) 2026 clinical practice guideline recommends preoperative exercise programs to help improve strength, flexibility, and endurance. Research also shows that prehab can improve certain early recovery outcomes, including strength and physical function.
Preparing your body before surgery may help you feel more confident and ready for the recovery process.
What Happens During Physical Therapy Right After Knee Replacement Surgery?
Physical therapy typically begins within 24 hours after knee replacement surgery. Depending on your health, surgical plan, and recovery, you may begin therapy in the hospital or an outpatient setting.
In fact, many knee replacement procedures are now performed on an outpatient basis, allowing patients who meet certain medical and safety requirements to return home the same day.
During this early stage, the main goals are to get your knee moving, improve circulation, and begin walking safely.
Your physical therapist may guide you through simple exercises such as:
- Ankle pumps: Moving your feet up and down to improve circulation and help reduce the risk of blood clots.
- Quad sets: Tightening the muscles in the front of your thigh to help rebuild strength.
- Heel slides: Gently sliding your heel toward your body to practice bending your knee.
- Knee extensions: Working on straightening your knee.
You will also begin walking short distances with a walker or another assistive device. Your therapist will help you practice getting in and out of bed, standing from a chair, and safely navigating stairs when needed.
It is normal to experience pain, stiffness, and swelling during this stage. Although movement may feel uncomfortable at first, following your prescribed exercise and walking program is an important part of recovery.
The goal is to get you moving safely while protecting your new knee.
What to Expect From Outpatient Physical Therapy After Knee Replacement
Once you are cleared to leave the hospital or surgical center, your recovery will continue at home and through physical therapy. Depending on your needs, you may receive home health therapy before transitioning to outpatient physical therapy.
Your physical therapist will develop a treatment plan based on your progress, surgeon’s recommendations, and personal goals.
Outpatient physical therapy appointments may occur two to three times per week, although the frequency and length of treatment will vary from person to person.
During this stage, treatment focuses on restoring knee movement, rebuilding strength, improving balance, and helping you return to everyday activities.
1. Reducing Pain and Swelling
Swelling and discomfort are common after knee replacement surgery. Managing these symptoms can make it easier to move your knee and participate in exercises.
Your physical therapist may recommend strategies such as:
- Elevating your leg to help manage swelling.
- Using ice or cold therapy to help reduce discomfort.
- Following your prescribed compression recommendations.
- Performing gentle exercises to encourage circulation.
Your therapist will also help you learn how to balance activity and rest as your body heals.
2. Restoring Knee Range of Motion
One of the most important goals after knee replacement surgery is restoring your knee’s range of motion (ROM).
Range of motion refers to how far you can bend and straighten your knee.
Your physical therapist will monitor your progress and guide you through exercises to improve both knee flexion (bending) and knee extension (straightening).
Getting your knee fully straight is especially important. Limited knee extension can affect your walking pattern, make standing more difficult, and place extra stress on other areas of your body.
Improving knee flexibility and movement will help you perform everyday activities with greater comfort and confidence.
3. Rebuilding Strength
Your muscles may become weaker after surgery due to pain, swelling, and reduced activity. Rebuilding strength is essential for supporting your new knee and returning to normal activities.
Your physical therapist will gradually introduce exercises that target the muscles surrounding your knee, including:
- Quadriceps (front thigh muscles)
- Hamstrings (back thigh muscles)
- Glutes (buttock muscles)
- Calf muscles
These muscles help support your knee when walking, standing, getting out of a chair, and climbing stairs.
As your strength improves, your therapist will progress your exercises to challenge your muscles safely and help you regain independence.
4. Improving Balance and Everyday Movement
Knee replacement recovery involves more than just strengthening your leg. You also need to relearn how to move comfortably and safely.
Your physical therapist will incorporate functional training to help you return to everyday activities.
This may include:
- Practicing sitting down and standing up from a chair.
- Walking on different surfaces.
- Going up and down stairs.
- Stepping over small obstacles.
- Improving balance and stability.
- Increasing your walking distance and endurance.
As your strength, balance, and walking ability improve, you will gradually reduce your reliance on a walker or cane when it is safe to do so.
The ultimate goal is to help you move confidently and return to your normal daily routine.
How Long Does It Take to Recover From Knee Replacement Surgery?
One of the most common questions patients ask is, “How long will it take before I feel normal again?”
While many patients make noticeable improvements during the first 8–12 weeks, recovery from total knee replacement can take several months. Some patients continue to see improvements in strength, flexibility, and comfort for up to a year or longer.
Your recovery timeline depends on several factors, including:
- Your strength and mobility before surgery.
- Your age and overall health.
- Your activity level.
- Whether you have other medical conditions.
- How consistently you follow your home exercise program.
- Your body’s response to surgery and rehabilitation.
It is important to remember that everyone recovers at a different pace. Comparing your progress to someone else’s can be frustrating. Instead, focus on your own goals and the improvements you make along the way.
Consistency is key! Attending your physical therapy appointments and completing your prescribed home exercises will help you continue building strength and improving mobility.
Get the Most Out of Your Knee Replacement Recovery With Physical Therapy
Knee replacement surgery is a big step toward reducing pain and improving your quality of life. Physical therapy is an important part of that journey, helping you prepare before surgery and regain strength, movement, and independence afterward.
Whether you are preparing for an upcoming knee replacement or are already recovering from surgery, working with a skilled physical therapist can help you stay on track toward your goals.
Are you considering knee replacement surgery or recovering from a recent procedure?
The physical therapists at Arizona Orthopedic Physical Therapy (AzOPT) are here to help! Our team provides individualized treatment plans designed to improve strength, mobility, and function so you can get back to doing the things you love.
Contact AzOPT today to schedule an assessment at one of our Arizona locations and learn how physical therapy can help you prepare for or recover from knee replacement surgery.
